Part 12

(16) ------------

1915. BIRD MIGRATION. U. S. Dept. Agr. Bull. 185, 47 pp., illus.

(17) ------------

1915. BIRD MIGRATIONS IN THE MACKENZIE VALLEY. Auk 32: 442-459, illus.

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1915. DISTRIBUTION AND MIGRATION OF NORTH AMERICAN GULLS AND THEIR ALLIES. U. S. Dept. Agr. Bull. 292, 70 pp., illus.

(19) Cooke, W. W.

1915. THE YELLOW-BILLED LOONI A PROBLEM TN MIGRATION. Condor 17: 213 214.

(20) Coues, E.

1878. BIRDS OF THE COLORADO VALLEY, A REPOSITORY OF SCIENTIFIC AND POPULAR INFORMATION CONCERNING NORTH AMERICAN ORNITHOLOGY. U. S. Dept. Int. Misc. Pub. 11, 807 pp., illus.

(21) Gätke, H.

1895. HELIGOLAND AS AN ORNITHOLOGICAL OBSERVATORY, THE RESULTS OF FIFTY YEARS' EXPERIENCE. (Transl. from the German by R. Rosenstock.) 599 pp., illus. Edinburgh.

(22) GRINNELL, J.

1931. SOME ANGLES IN THE PROBLEM OF BIRD MIGRATION. Auk 48: 22—32.

(23) Gross, A. O.

1927. THE SNOWY OWL MIGRATION OF 1926-27. Auk 44: 479-493, illus.

(24) Harrison, T. H.

1931. ON THE NORMAL FLIGHT SPEEDS OF BIRDS. Brit. Birds 25: 86-96.

(25) Lincoln, F. C.

1917. BOHEMIAN WAXWING (BOMBYCILLA GARRULA) IN COLORADO. Auk 34: 341.

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1922. TRAPPING DUCKS FOR BANDING PURPOSES: WITH AN ACCOUNT OF THE RESULTS OBTAINED FROM ONE WATERFOWL STATION. Auk 39: 322-334, illus.

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1924. BANDING NOTES ON THE MIGRATION OF THE PINTAIL. Condor 26: 88-90.

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1924. RETURNS FROM BANDED BIRDS, 1920 TO 1923. U. S. Dept. Agr. Bull. 1268, 56 pp., illus.

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1926. THE MIGRATION OF THE CACKLING GOOSE. Condor 28: 153-157, illus.